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JAMB Chemistry 2012 Paper

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Question : 40

Total: 45

Carbohydrates are large molecules with the molecular formula C

_x

_2

_y

. In which of the following pairs is x not equal to y?

glucose and starch
maltose and starch
sucrose and fructose
galactose and starch

Solution:

Glucose = C $_6$ (H $_2$ O) $_6$

= C $_6$ H $_{12}$ O $_6$

Maltose = C $_{12}$ (H $_2$ O) $_{11}$

= C $_{12}$ H $_{22}$ O $_{11}$

Starch = C $_6$ (H $_2$ O) $_5$

= C $_6$ H $_{10}$ O $_5$

Sucrose = C $_{12}$ (H $_2$ O) $_{11}$

= C $_{12}$ H $_{22}$ O $_{11}$

Fructose = C $_6$ (H $_2$ O) $_6$

= C $_6$ H $_{12}$ O $_6$

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